An American film maker has told a colleague by phone that she was arrested by Egyptian police while documenting clashes in Cairo's Tahrir Square.
Jehane Nojaim's producer Karim Amer says she was detained and her camera was confiscated.
He said Wednesday he was separated from her after they both fled from tear gas.
Nojaim is an award-winning film maker of Egyptian ancestry, best known for her 2004 documentary "Control Room" about the pan-Arab news station, Al-Jazeera.
Clashes resumed for a fifth day in central Cairo despite a promise by the head of the ruling military council to speed transition to civilian rule, aiming for next July. Protesters demand that the military leave office now.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
CAIRO (AP) _ International criticism of Egypt's military rulers mounted Wednesday as police clashed for a fifth day with protesters demanding the generals relinquish power immediately. A rights group raised the death toll for the wave of violence to at least 38.
The United Nations strongly condemned authorities for what it deemed an excessive use of force. Germany, one of Egypt's top trading partners, called for a quick transfer of power to a civilian government. The United States and the U.N. secretary general have already expressed their concern over the use of violence against mostly peaceful protesters.
Navi Pillay, the U.N. High Commissioner for Human Rights, deplored the role of Egypt's security forces in attempting to suppress protesters.
"Some of the images coming out of Tahrir, including the brutal beating of already subdued protesters, are deeply shocking, as are the reports of unarmed protesters being shot in the head," Pillay said. "There should be a prompt, impartial and independent investigation, and accountability for those found responsible for the abuses that have taken place should be ensured."
Clashes resumed for a fifth day despite a promise by the head of the ruling military council on Tuesday to speed up a presidential election to the first half of next year, a concession swiftly rejected by tens of thousands of protesters in Tahrir Square. The military previously floated late next year or early 2013 as the likely date for the vote, the last step in the process of transferring power to a civilian government.
The clashes are the longest spate of uninterrupted violence since the 18-day uprising that toppled the former regime in February.
The standoff at Tahrir and in other major cities such as Alexandria and Assiut has deepened the country's economic and security crisis less than a week before the first parliamentary elections since the ouster of longtime authoritarian leader Hosni Mubarak.
Field Marshal Hussein Tantawi tried to defuse tensions with his address late Tuesday, but he did not set a date for handing authority to a civilian government.
The Tahrir crowd, along with protesters in a string of other cities, want Tantawi to step down immediately in favor of an interim civilian administration to run the nation's affairs until a new parliament and president are elected.
The government offered more concessions on Wednesday, ordering the release of 312 protesters detained over the past days and instructing civilian prosecutors to take over a probe the military started into the death of 27 people, mostly Christians, in a protest on Oct. 9. The army is accused of involvement in the killings.
The military also denied that its troops around Tahrir Square used tear gas or fired at protesters, an assertion that runs against numerous witness accounts that say troops deployed outside the Interior Ministry were firing tear gas at protesters.
Street battles have been heaviest around the heavily fortified Interior Ministry, located on a side street that leads to the iconic square that was the epicenter of the uprising earlier this year. Police fired tear gas and rubber bullets to keep the protesters from storming the ministry, a sprawling complex that has for long been associated with the hated police and Mubarak's former regime.
An Associated Press reporter at the scene said a truce negotiated by Muslim clerics briefly held in the late afternoon, after both the protesters and the police pulled back from the front line street, scene of most of the fighting. State television, meanwhile, broadcast footage from the scene of the clashes showing army soldiers forming a human chain between the protesters and the police in a bid to stop the violence.
The truce was soon breached in a barrage of tear gas and rubber bullets from police and a shower of rocks by protesters.
One of the clerics, Mohammed Fawaz, said he and others were trying to regroup and try again to stop the fighting.
"We're scattered. we are trying to from a new human chain between protesters and police. We want the army to protect us," he said as a white cloud of tear gas hung low over the crowd and shots rang out.
Protester Islam Mohammed, 22, said a friend, Shehab Abdullah, died earlier in the day from what he said was a live bullet fired by police. "I will avenge his death. We all will," he said. "We are defending Tahrir square. If we sleep, police will attack us."
Soon after the truce was shattered, Egyptian-American filmmaker Jehan Nojaim was arrested, according to her friend and co-producer Karim Amer.
He said Nojaim called from her mobile telephone to say that she was detained by military police.
"They arrested her because they don't want anyone documenting what's happening," Amer said.
Elnadeem Center, an Egyptian rights group known for its careful research of victims of police violence, said late Tuesday that the number of protesters killed in clashes nationwide since Saturday is 38, three more than the Health Ministry's death toll, which went up to 35 on Wednesday. All but four of the deaths were in Cairo.
The clashes also have left at least 2,000 protesters wounded, mostly from gas inhalation or injuries caused by rubber bullets fired by the army and the police. The police deny using live ammunition.
Human Rights Watch on Tuesday cited morgue officials as saying at least 20 people have been killed by live ammunition.
Shady el-Nagar, a doctor in one of Tahrir's field hospitals, said three bodies arrived in the facility on Wednesday. All three had bullet wounds.
The turmoil broke out just days before the start of staggered parliamentary elections on Nov. 28. The votes will take place over months and conclude in March.
The Muslim Brotherhood, Egypt's strongest and best organized group, is not taking part in the ongoing protests in a move that is widely interpreted to be a reflection of its desire not to do anything that could derail the election, which it hopes win along with its allies.
Hundreds of Brotherhood supporters, however, have defied the leadership and joined the crowds in the square. Their participation is not likely to influence the Brotherhood's leadership or narrow the rift between the Islamist group and the secular organizations behind the uprising that toppled Mubarak and which are behind the latest spate of protests.
German Chancellor Angela Merkel, meanwhile, was said by a spokesman to be following events in Egypt "with great concern."
"In the new Egypt, which wants to be free and democratic, repression and the use of force against peaceful demonstrators can have no place," spokesman Steffen Seibert said in Berlin. "The demonstrators' demands ... for a quick transition to a civilian government are understandable from the German government's point of view," he added.
Associated Press writers Maggie Michael in Cairo and Frank Jordans in Geneva contributed to this report.